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Ubuntu - Environment variables

Environment variables are dynamic values which affect the processes or programs on a computer.

Environment variables are case-sensitive and usually they are created in upper case.

Common environment variables

Variable	Description
PATH	This variable contains a colon (:)-separated list of directories in which your system looks for executable files.
USER	The username
HOME	Default path to the user's home directory
EDITOR	Path to the program which edits the content of files
UID	User's unique ID
TERM	Default terminal emulator
SHELL	Shell being used by the user

Command	Description
echo $VARIABLE	To display value of a variable
env	Displays all environment variables
VARIABLE_NAME= variable_value	Create a new variable
unset	Remove a variable
export Variable=value To set value of an environment variable